today I installed windows 8 pro, perviously I was using windows 8 release preview. On Windows 8 RP all drivers were installed automatically but this time it isn't even updating from windows update nor it is searching online for drivers.
on windows 7.
There are no current Intel 915 drivers for Win8. Intel made these for Win7 and they worked because Win7 supported XPDM drivers. While that feature was left in for the Win8 previews, it was removed from the RTM. So, there is no 915GM driver that will work anymore.